diff --git a/include/string.h b/include/string.h
index 3b4c6007d7..1f6aef9f93 100644
--- a/include/string.h
+++ b/include/string.h
@@ -175,7 +175,7 @@ extern __typeof (strnlen) strnlen attribute_hidden;
 extern __typeof (strsep) strsep attribute_hidden;
 #endif
 
-#if (!IS_IN (libc) || !defined SHARED) \
+#if IS_IN (libc) && !defined SHARED \
   && !defined NO_MEMPCPY_STPCPY_REDIRECT
 /* Redirect calls to __builtin_mempcpy and __builtin_stpcpy to call
    __mempcpy and __stpcpy if not inlined.  */